The three public bike schemes were launched last November and allow commuters to rent bikes for €10 per year.
The first half hour of every journey is free, after which charges apply.
The NTA says it is happy with the public response to the three regional city schemes to date.
So far in Limerick, 31,368 journeys have been taken on the bikes.
The most popular journey is from Mount Saint Vincent to O’Connell Street, with 606 trips between the two stations to date.
The most popular station is Mary Immaculate College, from which 4,300 journeys have been taken.
Pery Square and Arthur’s Quay and O’Callaghans Strand are also among the busiest stations in the city, with 2,404, 2,118 and 2,032 journeys originating from each station respectively from January to September of this year.
In Cork, 6,789 people are signed up to the scheme and 2,029 in Galway. In Dublin, the first city to host a public bike scheme, some 42,000 people have subscribed.
164 people who signed up to the scheme in Limerick also joined one or both of the public bike schemes in Cork and Galway.